MAGNETOMECHANICAL COUPLING FACTOR (k33) OF Tb0.36Dy0.64(Fe0.85Co0.15)2 <110> ORIENTED CRYSTALS

<110> oriented crystals Tb0.36Dy0.64(Fe0.85Co0.15)2 have been prepared by zone melting directional solidification method. The magnetomechanical coupling factor (k33) was determined by resonance/anti-resonance method in low bias fields. It was found that k33 is sensitive to both the bias field and the compressive pre-stress. Without compressive pre-stress, optimum k33 can be obtained with the value of 0.513 at a bias field of 50.9 kA/m. When applying a compressive pre-stress of 10 MPa, relatively lower k33 was obtained. It was attributed that extra energy of 71° domain wall is induced by the compressive pre-stress, which hinders the movement of magnetic moments or domain walls, decreasing the transition efficiency between the magnetic and mechanical energies.